Datasheet

LTC3859
3
3859fa
ELECTRICAL CHARACTERISTICS
ORDER INFORMATION
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
BIAS
Bias Input Supply Operating Voltage
Range
4.5 38 V
V
FB1,2
Buck Regulated Feedback Voltage (Note 4); I
TH1,2
Voltage = 1.2V
–40°C to 125°C
–40°C to 85°C
l
0.788
0.792
0.800
0.800
0.812
0.808
V
V
V
FB3
Boost Regulated Feedback Voltage (Note 4); I
TH3
Voltage = 1.2V
–40°C to 125°C
–40°C to 85°C
l
1.182
1.188
1.200
1.200
1.218
1.212
V
V
I
FB1,2,3
Feedback Current (Note 4) ±5 ±50 nA
V
REFLNREG
Reference Voltage Line Regulation (Note 4); V
IN
= 4V to 38V 0.002 0.02 %/V
V
LOADREG
Output Voltage Load Regulation (Note 4)
Measured in Servo Loop;
DI
TH
Voltage = 1.2V to 0.7V
l
0.01 0.1 %
Measured in Servo Loop;
DI
TH
Voltage = 1.2V to 2V
l
–0.01 –0.1 %
g
m1,2,3
Transconductance Amplifier g
m
(Note 4); I
TH1,2,3
= 1.2V;
Sink/Source 5µA
2 mmho
I
Q
Input DC Supply Current (Note 5)
Pulse-Skipping or
Forced Continuous Mode
(One Channel On)
RUN1 = 5V and RUN2,3 = 0V or
RUN2 = 5V and RUN1,3 = 0V or
RUN3 = 5V and RUN1,2 = 0V
V
FB1, 2
ON = 0.83V (No Load)
V
FB3
= 1.25V
2mA
Pulse-Skipping or
Forced Continuous Mode
(All Channels On)
RUN1,2,3 = 5V,
V
FB1,2
= 0.83V (No Load)
V
FB3
= 1.25V
3mA
Sleep Mode
(One Channel On, Buck)
RUN1 = 5V and RUN2,3 = 0V or
RUN2 = 5V and RUN1,3 = 0V
V
FB,ON
= 0.83V (No Load)
55 80 µA
Sleep Mode
(One Channel On, Boost)
RUN3 = 5V and RUN1,2 = 0V
V
FB3
= 1.25V
55 80 µA
Sleep Mode
(Buck and Boost Channel On)
RUN1 = 5V and RUN2 = 0V or
RUN2 = 5V and RUN1 = 0V
RUN3 = 5V
V
FB1,2
= 0.83V (No Load)
V
FB3
= 1.25V
65 100 µA
Sleep Mode
(All Three Channels On)
RUN1,2,3 = 5V,
V
FB1,2
= 0.83V (No Load)
V
FB3
= 1.25V
80 120 µA
Shutdown RUN1,2,3 = 0V 14 30 µA
The l denotes the specifi cations which apply over the full operating junction
temperature range, otherwise specifi cations are at T
A
= 25°C. V
BIAS
= 12V, V
RUN1,2,3
= 5V, EXTV
CC
= 0V unless otherwise noted. (Note 2)
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3859EFE#PBF LTC3859EFE#TRPBF LTC3859FE 38-Lead Plastic TSSOP –40°C to 125°C
LTC3859IFE#PBF LTC3859IFE#TRPBF LTC3859FE 38-Lead Plastic TSSOP –40°C to 125°C
LTC3859EUHF#PBF LTC3859EUHF#TRPBF 3859
38-Lead (5mm ¥ 7mm) Plastic QFN
–40°C to 125°C
LTC3859IUHF#PBF LTC3859IUHF#TRPBF 3859
38-Lead (5mm ¥ 7mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi
cations, go to: http://www
.linear.com/tapeandreel/